This is a known C3 fault, the permanent cure is you get an additional loom basically a long piece of wire I think it is a resistive wire that you put into the dipped beam circuit, had mine done at a Citroen dealership 3 years ago after going through 5 new bulbs in about 3 months, never replaced one since, was told it needed it because the circuit gets a voltage surge The halogen bulbed C8's also suffer with this